From: Gabor Juhos Date: Tue, 21 Feb 2012 09:26:41 +0000 (+0000) Subject: ramips: rename the spi driver X-Git-Tag: reboot~14771 X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=a6d904b1d61b0985a3d4e2c323f8565382714330;p=openwrt%2Fstaging%2Fxback.git ramips: rename the spi driver SVN-Revision: 30669 --- diff --git a/target/linux/ramips/files/drivers/spi/ramips_spi.c b/target/linux/ramips/files/drivers/spi/ramips_spi.c deleted file mode 100644 index e6a2d8e561..0000000000 --- a/target/linux/ramips/files/drivers/spi/ramips_spi.c +++ /dev/null @@ -1,559 +0,0 @@ -/* - * ramips_spi.c -- Ralink RT288x/RT305x SPI controller driver - * - * Copyright (C) 2011 Sergiy - * Copyright (C) 2011 Gabor Juhos - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -#include -#include -#include -#include -#include -#include -#include -#include - -#define DRIVER_NAME "ramips-spi" -#define RALINK_NUM_CHIPSELECTS 1 /* only one slave is supported*/ -#define RALINK_SPI_WAIT_RDY_MAX_LOOP 2000 /* in usec */ - -#define RAMIPS_SPI_STAT 0x00 -#define RAMIPS_SPI_CFG 0x10 -#define RAMIPS_SPI_CTL 0x14 -#define RAMIPS_SPI_DATA 0x20 - -/* SPISTAT register bit field */ -#define SPISTAT_BUSY BIT(0) - -/* SPICFG register bit field */ -#define SPICFG_LSBFIRST 0 -#define SPICFG_MSBFIRST BIT(8) -#define SPICFG_SPICLKPOL BIT(6) -#define SPICFG_RXCLKEDGE_FALLING BIT(5) -#define SPICFG_TXCLKEDGE_FALLING BIT(4) -#define SPICFG_SPICLK_PRESCALE_MASK 0x7 -#define SPICFG_SPICLK_DIV2 0 -#define SPICFG_SPICLK_DIV4 1 -#define SPICFG_SPICLK_DIV8 2 -#define SPICFG_SPICLK_DIV16 3 -#define SPICFG_SPICLK_DIV32 4 -#define SPICFG_SPICLK_DIV64 5 -#define SPICFG_SPICLK_DIV128 6 -#define SPICFG_SPICLK_DISABLE 7 - -/* SPICTL register bit field */ -#define SPICTL_HIZSDO BIT(3) -#define SPICTL_STARTWR BIT(2) -#define SPICTL_STARTRD BIT(1) -#define SPICTL_SPIENA BIT(0) - -#ifdef DEBUG -#define spi_debug(args...) printk(args) -#else -#define spi_debug(args...) -#endif - -struct ramips_spi { - struct work_struct work; - - /* Lock access to transfer list.*/ - spinlock_t lock; - - struct list_head msg_queue; - struct spi_master *master; - void __iomem *base; - unsigned int sys_freq; - unsigned int speed; - - struct clk *clk; -}; - -static struct workqueue_struct *ramips_spi_wq; - -static inline struct ramips_spi *ramips_spidev_to_rs(struct spi_device *spi) -{ - return spi_master_get_devdata(spi->master); -} - -static inline u32 ramips_spi_read(struct ramips_spi *rs, u32 reg) -{ - return ioread32(rs->base + reg); -} - -static inline void ramips_spi_write(struct ramips_spi *rs, u32 reg, u32 val) -{ - iowrite32(val, rs->base + reg); -} - -static inline void ramips_spi_setbits(struct ramips_spi *rs, u32 reg, u32 mask) -{ - void __iomem *addr = rs->base + reg; - u32 val; - - val = ioread32(addr); - val |= mask; - iowrite32(val, addr); -} - -static inline void ramips_spi_clrbits(struct ramips_spi *rs, u32 reg, u32 mask) -{ - void __iomem *addr = rs->base + reg; - u32 val; - - val = ioread32(addr); - val &= ~mask; - iowrite32(val, addr); -} - -static int ramips_spi_baudrate_set(struct spi_device *spi, unsigned int speed) -{ - struct ramips_spi *rs = ramips_spidev_to_rs(spi); - u32 rate; - u32 prescale; - u32 reg; - - spi_debug("%s: speed:%u\n", __func__, speed); - - /* - * the supported rates are: 2,4,8...128 - * round up as we look for equal or less speed - */ - rate = DIV_ROUND_UP(rs->sys_freq, speed); - spi_debug("%s: rate-1:%u\n", __func__, rate); - rate = roundup_pow_of_two(rate); - spi_debug("%s: rate-2:%u\n", __func__, rate); - - /* check if requested speed is too small */ - if (rate > 128) - return -EINVAL; - - if (rate < 2) - rate = 2; - - /* Convert the rate to SPI clock divisor value. */ - prescale = ilog2(rate/2); - spi_debug("%s: prescale:%u\n", __func__, prescale); - - reg = ramips_spi_read(rs, RAMIPS_SPI_CFG); - reg = ((reg & ~SPICFG_SPICLK_PRESCALE_MASK) | prescale); - ramips_spi_write(rs, RAMIPS_SPI_CFG, reg); - rs->speed = speed; - return 0; -} - -/* - * called only when no transfer is active on the bus - */ -static int -ramips_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t) -{ - struct ramips_spi *rs = ramips_spidev_to_rs(spi); - unsigned int speed = spi->max_speed_hz; - int rc; - unsigned int bits_per_word = 8; - - if ((t != NULL) && t->speed_hz) - speed = t->speed_hz; - - if ((t != NULL) && t->bits_per_word) - bits_per_word = t->bits_per_word; - - if (rs->speed != speed) { - spi_debug("%s: speed_hz:%u\n", __func__, speed); - rc = ramips_spi_baudrate_set(spi, speed); - if (rc) - return rc; - } - - if (bits_per_word != 8) { - spi_debug("%s: bad bits_per_word: %u\n", __func__, - bits_per_word); - return -EINVAL; - } - - return 0; -} - -static void ramips_spi_set_cs(struct ramips_spi *rs, int enable) -{ - if (enable) - ramips_spi_clrbits(rs, RAMIPS_SPI_CTL, SPICTL_SPIENA); - else - ramips_spi_setbits(rs, RAMIPS_SPI_CTL, SPICTL_SPIENA); -} - -static inline int ramips_spi_wait_till_ready(struct ramips_spi *rs) -{ - int i; - - for (i = 0; i < RALINK_SPI_WAIT_RDY_MAX_LOOP; i++) { - u32 status; - - status = ramips_spi_read(rs, RAMIPS_SPI_STAT); - if ((status & SPISTAT_BUSY) == 0) - return 0; - - udelay(1); - } - - return -ETIMEDOUT; -} - -static unsigned int -ramips_spi_write_read(struct spi_device *spi, struct spi_transfer *xfer) -{ - struct ramips_spi *rs = ramips_spidev_to_rs(spi); - unsigned count = 0; - u8 *rx = xfer->rx_buf; - const u8 *tx = xfer->tx_buf; - int err; - - spi_debug("%s(%d): %s %s\n", __func__, xfer->len, - (tx != NULL) ? "tx" : " ", - (rx != NULL) ? "rx" : " "); - - if (tx) { - for (count = 0; count < xfer->len; count++) { - ramips_spi_write(rs, RAMIPS_SPI_DATA, tx[count]); - ramips_spi_setbits(rs, RAMIPS_SPI_CTL, SPICTL_STARTWR); - err = ramips_spi_wait_till_ready(rs); - if (err) { - dev_err(&spi->dev, "TX failed, err=%d\n", err); - goto out; - } - } - } - - if (rx) { - for (count = 0; count < xfer->len; count++) { - ramips_spi_setbits(rs, RAMIPS_SPI_CTL, SPICTL_STARTRD); - err = ramips_spi_wait_till_ready(rs); - if (err) { - dev_err(&spi->dev, "RX failed, err=%d\n", err); - goto out; - } - rx[count] = (u8) ramips_spi_read(rs, RAMIPS_SPI_DATA); - } - } - -out: - return count; -} - -static void ramips_spi_work(struct work_struct *work) -{ - struct ramips_spi *rs = - container_of(work, struct ramips_spi, work); - - spin_lock_irq(&rs->lock); - while (!list_empty(&rs->msg_queue)) { - struct spi_message *m; - struct spi_device *spi; - struct spi_transfer *t = NULL; - int par_override = 0; - int status = 0; - int cs_active = 0; - - m = container_of(rs->msg_queue.next, struct spi_message, - queue); - - list_del_init(&m->queue); - spin_unlock_irq(&rs->lock); - - spi = m->spi; - - /* Load defaults */ - status = ramips_spi_setup_transfer(spi, NULL); - - if (status < 0) - goto msg_done; - - list_for_each_entry(t, &m->transfers, transfer_list) { - if (par_override || t->speed_hz || t->bits_per_word) { - par_override = 1; - status = ramips_spi_setup_transfer(spi, t); - if (status < 0) - break; - if (!t->speed_hz && !t->bits_per_word) - par_override = 0; - } - - if (!cs_active) { - ramips_spi_set_cs(rs, 1); - cs_active = 1; - } - - if (t->len) - m->actual_length += - ramips_spi_write_read(spi, t); - - if (t->delay_usecs) - udelay(t->delay_usecs); - - if (t->cs_change) { - ramips_spi_set_cs(rs, 0); - cs_active = 0; - } - } - -msg_done: - if (cs_active) - ramips_spi_set_cs(rs, 0); - - m->status = status; - m->complete(m->context); - - spin_lock_irq(&rs->lock); - } - - spin_unlock_irq(&rs->lock); -} - -static int ramips_spi_setup(struct spi_device *spi) -{ - struct ramips_spi *rs = ramips_spidev_to_rs(spi); - - if ((spi->max_speed_hz == 0) || - (spi->max_speed_hz > (rs->sys_freq / 2))) - spi->max_speed_hz = (rs->sys_freq / 2); - - if (spi->max_speed_hz < (rs->sys_freq/128)) { - dev_err(&spi->dev, "setup: requested speed too low %d Hz\n", - spi->max_speed_hz); - return -EINVAL; - } - - if (spi->bits_per_word != 0 && spi->bits_per_word != 8) { - dev_err(&spi->dev, - "setup: requested bits per words - os wrong %d bpw\n", - spi->bits_per_word); - return -EINVAL; - } - - if (spi->bits_per_word == 0) - spi->bits_per_word = 8; - - /* - * baudrate & width will be set ramips_spi_setup_transfer - */ - return 0; -} - -static int ramips_spi_transfer(struct spi_device *spi, struct spi_message *m) -{ - struct ramips_spi *rs; - struct spi_transfer *t = NULL; - unsigned long flags; - - m->actual_length = 0; - m->status = 0; - - /* reject invalid messages and transfers */ - if (list_empty(&m->transfers) || !m->complete) - return -EINVAL; - - rs = ramips_spidev_to_rs(spi); - - list_for_each_entry(t, &m->transfers, transfer_list) { - unsigned int bits_per_word = spi->bits_per_word; - - if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) { - dev_err(&spi->dev, - "message rejected : " - "invalid transfer data buffers\n"); - goto msg_rejected; - } - - if (t->bits_per_word) - bits_per_word = t->bits_per_word; - - if (bits_per_word != 8) { - dev_err(&spi->dev, - "message rejected : " - "invalid transfer bits_per_word (%d bits)\n", - bits_per_word); - goto msg_rejected; - } - - if (t->speed_hz && t->speed_hz < (rs->sys_freq/128)) { - dev_err(&spi->dev, - "message rejected : " - "device min speed (%d Hz) exceeds " - "required transfer speed (%d Hz)\n", - (rs->sys_freq/128), t->speed_hz); - goto msg_rejected; - } - } - - - spin_lock_irqsave(&rs->lock, flags); - list_add_tail(&m->queue, &rs->msg_queue); - queue_work(ramips_spi_wq, &rs->work); - spin_unlock_irqrestore(&rs->lock, flags); - - return 0; -msg_rejected: - /* Message rejected and not queued */ - m->status = -EINVAL; - if (m->complete) - m->complete(m->context); - return -EINVAL; -} - -static void __init ramips_spi_reset(struct ramips_spi *rs) -{ - ramips_spi_write(rs, RAMIPS_SPI_CFG, - SPICFG_MSBFIRST | SPICFG_TXCLKEDGE_FALLING | - SPICFG_SPICLK_DIV16 | SPICFG_SPICLKPOL); - ramips_spi_write(rs, RAMIPS_SPI_CTL, SPICTL_HIZSDO | SPICTL_SPIENA); -} - -static int __init ramips_spi_probe(struct platform_device *pdev) -{ - struct spi_master *master; - struct ramips_spi *rs; - struct resource *r; - int status = 0; - - master = spi_alloc_master(&pdev->dev, sizeof(*rs)); - if (master == NULL) { - dev_dbg(&pdev->dev, "master allocation failed\n"); - return -ENOMEM; - } - - if (pdev->id != -1) - master->bus_num = pdev->id; - - /* we support only mode 0, and no options */ - master->mode_bits = 0; - - master->setup = ramips_spi_setup; - master->transfer = ramips_spi_transfer; - master->num_chipselect = RALINK_NUM_CHIPSELECTS; - - dev_set_drvdata(&pdev->dev, master); - - rs = spi_master_get_devdata(master); - rs->master = master; - - rs->clk = clk_get(NULL, "sys"); - if (IS_ERR(rs->clk)) { - status = PTR_ERR(rs->clk); - dev_err(&pdev->dev, "unable to get SYS clock, err=%d\n", - status); - goto out_put_master; - } - - status = clk_enable(rs->clk); - if (status) - goto out_put_clk; - - rs->sys_freq = clk_get_rate(rs->clk); - spi_debug("%s: sys_freq: %ld\n", __func__, rs->sys_freq); - - r = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (r == NULL) { - status = -ENODEV; - goto out_disable_clk; - } - - if (!request_mem_region(r->start, (r->end - r->start) + 1, - dev_name(&pdev->dev))) { - status = -EBUSY; - goto out_disable_clk; - } - - rs->base = ioremap(r->start, resource_size(r)); - if (rs->base == NULL) { - dev_err(&pdev->dev, "ioremap failed\n"); - status = -ENOMEM; - goto out_rel_mem; - } - - INIT_WORK(&rs->work, ramips_spi_work); - - spin_lock_init(&rs->lock); - INIT_LIST_HEAD(&rs->msg_queue); - - ramips_spi_reset(rs); - - status = spi_register_master(master); - if (status) - goto out_unmap_base; - - return 0; - -out_unmap_base: - iounmap(rs->base); -out_rel_mem: - release_mem_region(r->start, (r->end - r->start) + 1); -out_disable_clk: - clk_disable(rs->clk); -out_put_clk: - clk_put(rs->clk); -out_put_master: - spi_master_put(master); - return status; -} - -static int __devexit ramips_spi_remove(struct platform_device *pdev) -{ - struct spi_master *master; - struct ramips_spi *rs; - struct resource *r; - - master = dev_get_drvdata(&pdev->dev); - rs = spi_master_get_devdata(master); - - cancel_work_sync(&rs->work); - - iounmap(rs->base); - r = platform_get_resource(pdev, IORESOURCE_MEM, 0); - release_mem_region(r->start, (r->end - r->start) + 1); - - clk_disable(rs->clk); - clk_put(rs->clk); - spi_unregister_master(master); - - return 0; -} - -MODULE_ALIAS("platform:" DRIVER_NAME); - -static struct platform_driver ramips_spi_driver = { - .driver = { - .name = DRIVER_NAME, - .owner = THIS_MODULE, - }, - .remove = __devexit_p(ramips_spi_remove), -}; - -static int __init ramips_spi_init(void) -{ - ramips_spi_wq = create_singlethread_workqueue( - ramips_spi_driver.driver.name); - if (ramips_spi_wq == NULL) - return -ENOMEM; - - return platform_driver_probe(&ramips_spi_driver, ramips_spi_probe); -} -module_init(ramips_spi_init); - -static void __exit ramips_spi_exit(void) -{ - flush_workqueue(ramips_spi_wq); - platform_driver_unregister(&ramips_spi_driver); - - destroy_workqueue(ramips_spi_wq); -} -module_exit(ramips_spi_exit); - -MODULE_DESCRIPTION("Ralink SPI driver"); -MODULE_AUTHOR("Sergiy "); -MODULE_AUTHOR("Gabor Juhos "); -MODULE_LICENSE("GPL"); diff --git a/target/linux/ramips/files/drivers/spi/spi-ramips.c b/target/linux/ramips/files/drivers/spi/spi-ramips.c new file mode 100644 index 0000000000..e6a2d8e561 --- /dev/null +++ b/target/linux/ramips/files/drivers/spi/spi-ramips.c @@ -0,0 +1,559 @@ +/* + * ramips_spi.c -- Ralink RT288x/RT305x SPI controller driver + * + * Copyright (C) 2011 Sergiy + * Copyright (C) 2011 Gabor Juhos + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define DRIVER_NAME "ramips-spi" +#define RALINK_NUM_CHIPSELECTS 1 /* only one slave is supported*/ +#define RALINK_SPI_WAIT_RDY_MAX_LOOP 2000 /* in usec */ + +#define RAMIPS_SPI_STAT 0x00 +#define RAMIPS_SPI_CFG 0x10 +#define RAMIPS_SPI_CTL 0x14 +#define RAMIPS_SPI_DATA 0x20 + +/* SPISTAT register bit field */ +#define SPISTAT_BUSY BIT(0) + +/* SPICFG register bit field */ +#define SPICFG_LSBFIRST 0 +#define SPICFG_MSBFIRST BIT(8) +#define SPICFG_SPICLKPOL BIT(6) +#define SPICFG_RXCLKEDGE_FALLING BIT(5) +#define SPICFG_TXCLKEDGE_FALLING BIT(4) +#define SPICFG_SPICLK_PRESCALE_MASK 0x7 +#define SPICFG_SPICLK_DIV2 0 +#define SPICFG_SPICLK_DIV4 1 +#define SPICFG_SPICLK_DIV8 2 +#define SPICFG_SPICLK_DIV16 3 +#define SPICFG_SPICLK_DIV32 4 +#define SPICFG_SPICLK_DIV64 5 +#define SPICFG_SPICLK_DIV128 6 +#define SPICFG_SPICLK_DISABLE 7 + +/* SPICTL register bit field */ +#define SPICTL_HIZSDO BIT(3) +#define SPICTL_STARTWR BIT(2) +#define SPICTL_STARTRD BIT(1) +#define SPICTL_SPIENA BIT(0) + +#ifdef DEBUG +#define spi_debug(args...) printk(args) +#else +#define spi_debug(args...) +#endif + +struct ramips_spi { + struct work_struct work; + + /* Lock access to transfer list.*/ + spinlock_t lock; + + struct list_head msg_queue; + struct spi_master *master; + void __iomem *base; + unsigned int sys_freq; + unsigned int speed; + + struct clk *clk; +}; + +static struct workqueue_struct *ramips_spi_wq; + +static inline struct ramips_spi *ramips_spidev_to_rs(struct spi_device *spi) +{ + return spi_master_get_devdata(spi->master); +} + +static inline u32 ramips_spi_read(struct ramips_spi *rs, u32 reg) +{ + return ioread32(rs->base + reg); +} + +static inline void ramips_spi_write(struct ramips_spi *rs, u32 reg, u32 val) +{ + iowrite32(val, rs->base + reg); +} + +static inline void ramips_spi_setbits(struct ramips_spi *rs, u32 reg, u32 mask) +{ + void __iomem *addr = rs->base + reg; + u32 val; + + val = ioread32(addr); + val |= mask; + iowrite32(val, addr); +} + +static inline void ramips_spi_clrbits(struct ramips_spi *rs, u32 reg, u32 mask) +{ + void __iomem *addr = rs->base + reg; + u32 val; + + val = ioread32(addr); + val &= ~mask; + iowrite32(val, addr); +} + +static int ramips_spi_baudrate_set(struct spi_device *spi, unsigned int speed) +{ + struct ramips_spi *rs = ramips_spidev_to_rs(spi); + u32 rate; + u32 prescale; + u32 reg; + + spi_debug("%s: speed:%u\n", __func__, speed); + + /* + * the supported rates are: 2,4,8...128 + * round up as we look for equal or less speed + */ + rate = DIV_ROUND_UP(rs->sys_freq, speed); + spi_debug("%s: rate-1:%u\n", __func__, rate); + rate = roundup_pow_of_two(rate); + spi_debug("%s: rate-2:%u\n", __func__, rate); + + /* check if requested speed is too small */ + if (rate > 128) + return -EINVAL; + + if (rate < 2) + rate = 2; + + /* Convert the rate to SPI clock divisor value. */ + prescale = ilog2(rate/2); + spi_debug("%s: prescale:%u\n", __func__, prescale); + + reg = ramips_spi_read(rs, RAMIPS_SPI_CFG); + reg = ((reg & ~SPICFG_SPICLK_PRESCALE_MASK) | prescale); + ramips_spi_write(rs, RAMIPS_SPI_CFG, reg); + rs->speed = speed; + return 0; +} + +/* + * called only when no transfer is active on the bus + */ +static int +ramips_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t) +{ + struct ramips_spi *rs = ramips_spidev_to_rs(spi); + unsigned int speed = spi->max_speed_hz; + int rc; + unsigned int bits_per_word = 8; + + if ((t != NULL) && t->speed_hz) + speed = t->speed_hz; + + if ((t != NULL) && t->bits_per_word) + bits_per_word = t->bits_per_word; + + if (rs->speed != speed) { + spi_debug("%s: speed_hz:%u\n", __func__, speed); + rc = ramips_spi_baudrate_set(spi, speed); + if (rc) + return rc; + } + + if (bits_per_word != 8) { + spi_debug("%s: bad bits_per_word: %u\n", __func__, + bits_per_word); + return -EINVAL; + } + + return 0; +} + +static void ramips_spi_set_cs(struct ramips_spi *rs, int enable) +{ + if (enable) + ramips_spi_clrbits(rs, RAMIPS_SPI_CTL, SPICTL_SPIENA); + else + ramips_spi_setbits(rs, RAMIPS_SPI_CTL, SPICTL_SPIENA); +} + +static inline int ramips_spi_wait_till_ready(struct ramips_spi *rs) +{ + int i; + + for (i = 0; i < RALINK_SPI_WAIT_RDY_MAX_LOOP; i++) { + u32 status; + + status = ramips_spi_read(rs, RAMIPS_SPI_STAT); + if ((status & SPISTAT_BUSY) == 0) + return 0; + + udelay(1); + } + + return -ETIMEDOUT; +} + +static unsigned int +ramips_spi_write_read(struct spi_device *spi, struct spi_transfer *xfer) +{ + struct ramips_spi *rs = ramips_spidev_to_rs(spi); + unsigned count = 0; + u8 *rx = xfer->rx_buf; + const u8 *tx = xfer->tx_buf; + int err; + + spi_debug("%s(%d): %s %s\n", __func__, xfer->len, + (tx != NULL) ? "tx" : " ", + (rx != NULL) ? "rx" : " "); + + if (tx) { + for (count = 0; count < xfer->len; count++) { + ramips_spi_write(rs, RAMIPS_SPI_DATA, tx[count]); + ramips_spi_setbits(rs, RAMIPS_SPI_CTL, SPICTL_STARTWR); + err = ramips_spi_wait_till_ready(rs); + if (err) { + dev_err(&spi->dev, "TX failed, err=%d\n", err); + goto out; + } + } + } + + if (rx) { + for (count = 0; count < xfer->len; count++) { + ramips_spi_setbits(rs, RAMIPS_SPI_CTL, SPICTL_STARTRD); + err = ramips_spi_wait_till_ready(rs); + if (err) { + dev_err(&spi->dev, "RX failed, err=%d\n", err); + goto out; + } + rx[count] = (u8) ramips_spi_read(rs, RAMIPS_SPI_DATA); + } + } + +out: + return count; +} + +static void ramips_spi_work(struct work_struct *work) +{ + struct ramips_spi *rs = + container_of(work, struct ramips_spi, work); + + spin_lock_irq(&rs->lock); + while (!list_empty(&rs->msg_queue)) { + struct spi_message *m; + struct spi_device *spi; + struct spi_transfer *t = NULL; + int par_override = 0; + int status = 0; + int cs_active = 0; + + m = container_of(rs->msg_queue.next, struct spi_message, + queue); + + list_del_init(&m->queue); + spin_unlock_irq(&rs->lock); + + spi = m->spi; + + /* Load defaults */ + status = ramips_spi_setup_transfer(spi, NULL); + + if (status < 0) + goto msg_done; + + list_for_each_entry(t, &m->transfers, transfer_list) { + if (par_override || t->speed_hz || t->bits_per_word) { + par_override = 1; + status = ramips_spi_setup_transfer(spi, t); + if (status < 0) + break; + if (!t->speed_hz && !t->bits_per_word) + par_override = 0; + } + + if (!cs_active) { + ramips_spi_set_cs(rs, 1); + cs_active = 1; + } + + if (t->len) + m->actual_length += + ramips_spi_write_read(spi, t); + + if (t->delay_usecs) + udelay(t->delay_usecs); + + if (t->cs_change) { + ramips_spi_set_cs(rs, 0); + cs_active = 0; + } + } + +msg_done: + if (cs_active) + ramips_spi_set_cs(rs, 0); + + m->status = status; + m->complete(m->context); + + spin_lock_irq(&rs->lock); + } + + spin_unlock_irq(&rs->lock); +} + +static int ramips_spi_setup(struct spi_device *spi) +{ + struct ramips_spi *rs = ramips_spidev_to_rs(spi); + + if ((spi->max_speed_hz == 0) || + (spi->max_speed_hz > (rs->sys_freq / 2))) + spi->max_speed_hz = (rs->sys_freq / 2); + + if (spi->max_speed_hz < (rs->sys_freq/128)) { + dev_err(&spi->dev, "setup: requested speed too low %d Hz\n", + spi->max_speed_hz); + return -EINVAL; + } + + if (spi->bits_per_word != 0 && spi->bits_per_word != 8) { + dev_err(&spi->dev, + "setup: requested bits per words - os wrong %d bpw\n", + spi->bits_per_word); + return -EINVAL; + } + + if (spi->bits_per_word == 0) + spi->bits_per_word = 8; + + /* + * baudrate & width will be set ramips_spi_setup_transfer + */ + return 0; +} + +static int ramips_spi_transfer(struct spi_device *spi, struct spi_message *m) +{ + struct ramips_spi *rs; + struct spi_transfer *t = NULL; + unsigned long flags; + + m->actual_length = 0; + m->status = 0; + + /* reject invalid messages and transfers */ + if (list_empty(&m->transfers) || !m->complete) + return -EINVAL; + + rs = ramips_spidev_to_rs(spi); + + list_for_each_entry(t, &m->transfers, transfer_list) { + unsigned int bits_per_word = spi->bits_per_word; + + if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) { + dev_err(&spi->dev, + "message rejected : " + "invalid transfer data buffers\n"); + goto msg_rejected; + } + + if (t->bits_per_word) + bits_per_word = t->bits_per_word; + + if (bits_per_word != 8) { + dev_err(&spi->dev, + "message rejected : " + "invalid transfer bits_per_word (%d bits)\n", + bits_per_word); + goto msg_rejected; + } + + if (t->speed_hz && t->speed_hz < (rs->sys_freq/128)) { + dev_err(&spi->dev, + "message rejected : " + "device min speed (%d Hz) exceeds " + "required transfer speed (%d Hz)\n", + (rs->sys_freq/128), t->speed_hz); + goto msg_rejected; + } + } + + + spin_lock_irqsave(&rs->lock, flags); + list_add_tail(&m->queue, &rs->msg_queue); + queue_work(ramips_spi_wq, &rs->work); + spin_unlock_irqrestore(&rs->lock, flags); + + return 0; +msg_rejected: + /* Message rejected and not queued */ + m->status = -EINVAL; + if (m->complete) + m->complete(m->context); + return -EINVAL; +} + +static void __init ramips_spi_reset(struct ramips_spi *rs) +{ + ramips_spi_write(rs, RAMIPS_SPI_CFG, + SPICFG_MSBFIRST | SPICFG_TXCLKEDGE_FALLING | + SPICFG_SPICLK_DIV16 | SPICFG_SPICLKPOL); + ramips_spi_write(rs, RAMIPS_SPI_CTL, SPICTL_HIZSDO | SPICTL_SPIENA); +} + +static int __init ramips_spi_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct ramips_spi *rs; + struct resource *r; + int status = 0; + + master = spi_alloc_master(&pdev->dev, sizeof(*rs)); + if (master == NULL) { + dev_dbg(&pdev->dev, "master allocation failed\n"); + return -ENOMEM; + } + + if (pdev->id != -1) + master->bus_num = pdev->id; + + /* we support only mode 0, and no options */ + master->mode_bits = 0; + + master->setup = ramips_spi_setup; + master->transfer = ramips_spi_transfer; + master->num_chipselect = RALINK_NUM_CHIPSELECTS; + + dev_set_drvdata(&pdev->dev, master); + + rs = spi_master_get_devdata(master); + rs->master = master; + + rs->clk = clk_get(NULL, "sys"); + if (IS_ERR(rs->clk)) { + status = PTR_ERR(rs->clk); + dev_err(&pdev->dev, "unable to get SYS clock, err=%d\n", + status); + goto out_put_master; + } + + status = clk_enable(rs->clk); + if (status) + goto out_put_clk; + + rs->sys_freq = clk_get_rate(rs->clk); + spi_debug("%s: sys_freq: %ld\n", __func__, rs->sys_freq); + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (r == NULL) { + status = -ENODEV; + goto out_disable_clk; + } + + if (!request_mem_region(r->start, (r->end - r->start) + 1, + dev_name(&pdev->dev))) { + status = -EBUSY; + goto out_disable_clk; + } + + rs->base = ioremap(r->start, resource_size(r)); + if (rs->base == NULL) { + dev_err(&pdev->dev, "ioremap failed\n"); + status = -ENOMEM; + goto out_rel_mem; + } + + INIT_WORK(&rs->work, ramips_spi_work); + + spin_lock_init(&rs->lock); + INIT_LIST_HEAD(&rs->msg_queue); + + ramips_spi_reset(rs); + + status = spi_register_master(master); + if (status) + goto out_unmap_base; + + return 0; + +out_unmap_base: + iounmap(rs->base); +out_rel_mem: + release_mem_region(r->start, (r->end - r->start) + 1); +out_disable_clk: + clk_disable(rs->clk); +out_put_clk: + clk_put(rs->clk); +out_put_master: + spi_master_put(master); + return status; +} + +static int __devexit ramips_spi_remove(struct platform_device *pdev) +{ + struct spi_master *master; + struct ramips_spi *rs; + struct resource *r; + + master = dev_get_drvdata(&pdev->dev); + rs = spi_master_get_devdata(master); + + cancel_work_sync(&rs->work); + + iounmap(rs->base); + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + release_mem_region(r->start, (r->end - r->start) + 1); + + clk_disable(rs->clk); + clk_put(rs->clk); + spi_unregister_master(master); + + return 0; +} + +MODULE_ALIAS("platform:" DRIVER_NAME); + +static struct platform_driver ramips_spi_driver = { + .driver = { + .name = DRIVER_NAME, + .owner = THIS_MODULE, + }, + .remove = __devexit_p(ramips_spi_remove), +}; + +static int __init ramips_spi_init(void) +{ + ramips_spi_wq = create_singlethread_workqueue( + ramips_spi_driver.driver.name); + if (ramips_spi_wq == NULL) + return -ENOMEM; + + return platform_driver_probe(&ramips_spi_driver, ramips_spi_probe); +} +module_init(ramips_spi_init); + +static void __exit ramips_spi_exit(void) +{ + flush_workqueue(ramips_spi_wq); + platform_driver_unregister(&ramips_spi_driver); + + destroy_workqueue(ramips_spi_wq); +} +module_exit(ramips_spi_exit); + +MODULE_DESCRIPTION("Ralink SPI driver"); +MODULE_AUTHOR("Sergiy "); +MODULE_AUTHOR("Gabor Juhos "); +MODULE_LICENSE("GPL"); diff --git a/target/linux/ramips/patches-3.2/105-ramips-spi-driver.patch b/target/linux/ramips/patches-3.2/105-ramips-spi-driver.patch index 13794817fe..f7e57a5019 100644 --- a/target/linux/ramips/patches-3.2/105-ramips-spi-driver.patch +++ b/target/linux/ramips/patches-3.2/105-ramips-spi-driver.patch @@ -19,7 +19,7 @@ obj-$(CONFIG_SPI_PPC4xx) += spi-ppc4xx.o obj-$(CONFIG_SPI_PXA2XX) += spi-pxa2xx.o obj-$(CONFIG_SPI_PXA2XX_PCI) += spi-pxa2xx-pci.o -+obj-$(CONFIG_SPI_RAMIPS) += ramips_spi.o ++obj-$(CONFIG_SPI_RAMIPS) += spi-ramips.o obj-$(CONFIG_SPI_S3C24XX) += spi-s3c24xx-hw.o spi-s3c24xx-hw-y := spi-s3c24xx.o spi-s3c24xx-hw-$(CONFIG_SPI_S3C24XX_FIQ) += spi-s3c24xx-fiq.o